Ballmer: Windows Phone 7 Not Successful Yet — While Microsoft has enjoyed many successes over the past year, Windows Phone 7 hasn't been among them, admitted Microsoft CEO Steve Ballmer during the opening keynote Monday at the 2011 Microsoft Worldwide Partner Conference, being held this week in Los Angeles.

Google: Changes coming to Google+ this week — Top Google exec acknowledges hearing “lots of criticisms” about Google +, and that the firm plans to respond quickly — Computerworld - It looks like Google will be making some changes to Google+ this week. — In a post on Google+ …

Foursquare Partners Up — Start-up Foursquare Labs Inc. has a large user base and a $600 million valuation, but unlike social-media stars Zynga Inc. and LinkedIn Corp., it has a big hole on the revenue line. — Now, the service, which lets users announce their location to friends by …

Cisco Said to Be Cutting as Many as 10,000 Jobs — Cisco Systems Inc. (CSCO), the largest networking-equipment company, may cut as many as 10,000 jobs, or about 14 percent of its workforce, to revive profit growth, according to two people familiar with the plans.

How Banks Plan To Compete With Groupon — So much valuable data here! — Credit card companies are sitting on a wealth of information about their clients — they have a running record of everything they buy. Due to strict rules entitling consumers to financial privacy, though, banks are limited in the secondary use of that data.

One Million Registered Twitter Apps — Application developers play a fundamental role in helping people get the best out of Twitter. As an ecosystem, we've just crossed one million registered applications, built by more than 750,000 developers around the world. This is up from 150,000 apps just a year ago.

Florida Judge Tosses a Key MPAA Claim Against Hotfile (Exclusive) … Some higher-ups in the movie industry have identified file-storage “cyberlockers” as being Hollywood's biggest threat in the war against piracy. In February, the MPAA took action with a major lawsuit against Hotfile, one of the most popular websites on the Internet.

Amazon Backs End to Online Sales Tax in California — SAN FRANCISCO — Amazon said Monday that it would back a California ballot initiative that would roll back a new state law that forces more online retailers to collect sales tax. — Amazon's decision to support the proposed referendum pits …